Committed to Service
MEMORANDUM
Date:
To:
Carol A. McKee – President
Sherry R. Huber – 1st Vice President
Dave Bivens – 2nd Vice President
John S. Franden – Commissioner
Rebecca W. Arnold – Commissioner
Capital Projects Department
January 7, 2008
ACHD’s Design Consultants
From:
Ross Oyen
Subject:
General Special Provision – Construction Traffic Control Installation
General Special Provision – Construction Traffic Control Administration
General Special Provision – Construction Traffic Control Measurement and Payment
ACHD has adopted the three enclosed general special provisions for the installation, administration,
measurement and payment of construction traffic control. Please implement the provisions on all
current and future projects. For questions, contact the assigned project manager
Cc: Colin Farr, Bruce Mills, Dale Kuperus, Dorrell Hansen, ACHD’s Project Managers, Central Files
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208 387 6100 • FX 345-7650 • www.achd.ada.id.us
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CONSTRUCTION TRAFFIC CONTROL INSTALLATION
ITEM 1103 – CONSTRUCTION TRAFFIC CONTROL
ON PAGE 6 OF SECTION 1103 OF THE ISPWC, PART 3 – WORKMANSHIP, SUBSECTION 3.1 GENERAL, add the following:
L. Temporary work zone traffic control (TC) equipment placed in public right-of-way under Ada
County Highway District (ACHD) jurisdiction shall be placed in accordance with Section 6F.03
of the Manual on Uniform Traffic Control Devices (MUTCD) and as follows.
1. Ground mounted signs installed at the side of the road in rural areas shall be mounted at a
height of at least 5 ft, measured from the bottom of the sign to the near edge of the
pavement. In business, commercial, and residential districts where parking and / or
bicycle or pedestrian movement is likely to occur, or where there are other obstructions to
sign visibility, or where there are two or more through lanes in each direction, the
distance between the bottom of the sign and the near edge of the traveled way shall be at
least 7 ft.
2. Neither portable nor permanent sign supports or barrels should be located on sidewalks,
bicycle facilities, or areas designated for pedestrian or bicycle traffic, unless required for
construction activities, in which case suitable detours must be provided. Signs mounted
lower than 7 ft should not project more than 4 inches into pedestrian facilities.
3. The height to the bottom of a secondary sign mounted below another sign may be 1 ft
less than the appropriate height specified above.
4. All traffic control signs that will be left in place for longer than three (3) days shall be
mounted on a wood or metal post set at least 30” into the ground or as directed by the
Engineer. Temporary installations will be allowed for signs left in place less than three
(3) days. All sign supports shall be crashworthy in accordance with NCHRP 350
standards. Exceptions to this are the following signs from the MUTCD: R9-8 through
R9-11a (Pedestrian and Sidewalk series), R11 (Road Closed series), W1-6 through W1-8
(Horizontal Arrow series), M4-10 (Horizontal Detour Arrow), or other similar types of
signs that are typically mounted on portable barricades.
5. Signs mounted on barricades and barricade / sign combinations shall be crashworthy.
6. Signs mounted on barricades or other portable supports shall be no less than 1 ft above
the traveled way. Sign installations of this type shall only be allowed where approved by
the Engineer.
7. Signs mounted on barricades shall not cover more than 50% of the top two rails or 33%
of the total area of the three rails.
8. Large signs having an area exceeding 50 square feet that are installed on multiple
crashworthy posts shall be mounted a minimum of 7 ft above the ground.
9. Temporary work zone traffic control signs that are not needed at the end of the work day
are to be covered, turned, or removed from the work site. Signs that are covered or
turned shall be delineated by the use of reflective tape, cones, or barrels. Signs mounted
on portable supports are not to be rotated to a horizontal orientation; this creates a
hazardous obstruction.
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208 387 6100 • FX 345-7650 • www.achd.ada.id.us
Construction Traffic Control Installation, Administration, Measurement & Payment General Special Provision - January 7, 2008
Page 2 of 4
CONSTRUCTION TRAFFIC CONTROL ADMINISTRATION
All traffic control (TC) signing and detours are to be in place and approved by the engineer prior to the
Contractor starting work. All signing and channelization shall be per the Manual of Uniform Traffic
Control Devices (MUTCD), latest edition, and Section 1103 of the Idaho Standards for Public Works
Construction (ISPWC). The engineer or his representative will be the sole judge in determining the
acceptability of the condition and appearance of the traffic control and work zone devices. Devices or
signs determined to be in unacceptable condition are to be promptly replaced with materials of
acceptable condition and appearance.
All stop and street name signs will remain installed and visible at their current location at all times.
Temporary stop and street name signs shall be provided for traffic control while the permanent signs are
being replaced, relocated, or are obstructed.
The contractor may be required as part of this item to install and move the traffic control drums
numerous times as needed to properly control traffic on the project.
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208 387 6100 • FX 345-7650 • www.achd.ada.id.us
Construction Traffic Control Installation, Administration, Measurement & Payment General Special Provision - January 7, 2008
Page 3 of 4
CONSTRUCTION TRAFFIC CONTROL MEASUREMENT AND PAYMENT
ITEM 1103 – CONSTRUCTION TRAFFIC CONTROL
ON PAGE 7 OF SECTION 1103 OF THE ISPWC, Part 4 – Measurement and Payment, replace
subsection 4.1 and replace with the following sections:
4.1.
An itemized list of all traffic control items installed on the project and their respective
certifications shall be delivered to the project inspector within 48 hours of installation.
4.2.
The traffic control (TC) devices shall be paid as listed on the bid item schedule.
Miscellaneous traffic control items including flashers and flags shall be considered incidental to
other traffic control items and no separate payment will be made.
4.3.
The accepted quantity of construction signs will be paid for at the contract unit price bid
per square foot for the initial installation only. Signs utilized for multiple construction phases
shall be paid for at the contract unit price bid per square foot for the initial installation only.
Additional payment will not be made for signs that are removed from the project and reinstalled
during a later phase of construction. Relocation of signs within the project after the initial
installation shall be paid for under the Traffic Control Maintenance item, as authorized by the
Engineer.
4.4.
Traffic Control Maintenance and flagging are to be initiated only by authorization of the
project inspector. TC Maintenance personnel and Flaggers are to notify the project inspector
upon arrival on site. Invoices for TC Maintenance and Flagger hours are to be provided to the
project inspector within 48 hours of the day the activity took place.
4.5.
The cost to cover, relocate and/or reinstall existing permanent traffic control signs as
required within the construction limits shall be incidental to the other traffic control items of
work, and no separate payment shall be made. This work shall be performed in accordance with
the Manual on Uniform Traffic Control Devices, current edition.
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208 387 6100 • FX 345-7650 • www.achd.ada.id.us
Construction Traffic Control Installation, Administration, Measurement & Payment General Special Provision - January 7, 2008
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